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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A387623 a(n) = Sum_{k=0..floor(n/4)} 2^k * binomial(2*n-6*k,2*k).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 3
5 13
6 31
7 57
8 95
9 193
10 463
11 1081
12 2295
13 4609
14 9423
15 20185
16 44071
17 94801
18 199807
19 418921
20 885879
21 1889889
22 4034639
23 8573561
24 18155399
25 38461105
26 81665695
27 173627401
28 368961431
29 783201921
30 1661811055
31 3527298329
32 7490519335
33 15908549329
34 33779968447

List of values

[1, 1, 1, 1, 3, 13, 31, 57, 95, 193, 463, 1081, 2295, 4609, 9423, 20185, 44071, 94801, 199807, 418921, 885879, 1889889, 4034639, 8573561, 18155399, 38461105, 81665695, 173627401, 368961431, 783201921, 1661811055, 3527298329, 7490519335, 15908549329, 33779968447]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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